Contraceptive and recreational drugs interactions

My girlfriend has been in a panic lately about her contraceptive pill (mercilon). Previously she has always had a bar in her arm but switched 2 months ago to the pill. Do any of the following affect how well the pill works:MephedroneMethyloneCocaineMdmaAlcoholor in any combination of the above?

There are not significative pharmacological interactions known between recreational drugs and hormonal anticonceptives. The only exception is tobacco, that, in combination with some hormones can raise the risk of some cardiovascular problems.